The Chadian government has accused Sudan's army of attacking a town on their border after days of rebel raids.
Communications Minister Mahamat Hissene told the BBC that the garrison town of Ade had been attacked by ground troops supported by helicopters.
Mr Hissene said the fighting was continuing and confirmed a rebel raid on the smaller town of Am Zoer.
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Chad denied the allegation but the UN says Sudan and Chad have been fighting a proxy war through each other's rebel groups.
The two countries have signed numerous peace deals but these have never held.
In February, Chadian rebels reached President Deby's palace before being repelled by government forces.
In recent days, the rebels have attacked several towns in the east, briefly occupied them and then moved on.
They say their intention is to march to N'Djamena, 750km (470 miles) away, to oust President Idris Deby.
(BBC)
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